Trapped Electrons in Irradiated Quartz and Silica: II, Electron Spin Resonance

Weeks, R. A.; Nelson, C. M.

doi:10.1111/j.1151-2916.1960.tb13682.x

Cited by 203 publications

(40 citation statements)

References 7 publications

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“…For the implementation of SSTFM, Payne et al [9] suggested to use a crystalline silicon (c-Si) scanning probe tip with an amorphous silicondioxide (SiO 2 ) film in which a single E' center [14][15][16][17] would be used as probe spin, located at the apex. E' centers exhibit positive correlation energies and are therefore paramagnetic, a property that allows them to be studied with electron paramagnetic resonance (EPR) spectroscopy [18,19].…”

Section: Introductionmentioning

confidence: 99%

Spin-Relaxation Dynamics ofE′Centers at High Density inSiO2Thin Films for Single-Spin Tunneling Force Microscopy

et al. 2015

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The suitability of the spin-dynamics of paramagnetic silicon dangling bonds (E' centers) in high E'-density amorphous silicon dioxide (SiO2) as probe spins for single-spin tunneling force microscopy (SSTFM) is studied. SSTFM is a spin-selection rule based scanning-probe single-spin readout concept. Following the synthesis of SiO2 thin films on (111) oriented crystalline silicon substrates with room-temperature stable densities of [E ] > 5×10 18 cm −3 throughout the 60nm thin film, pulsed electron paramagnetic resonance spectroscopy was conducted on the E' centers at temperatures between T = 5K and T = 70K. The measurements revealed that the spin coherence (the transverse spin-relaxation time T2) of these centers is significantly shortened compared to low-E' density SiO2 films and within error margins not dependent on temperature. In contrast, the spin-flip times (the longitudinal relaxation times T1) are dependent on the temperature but with much weaker dependence than low-density SiO2, with greatest deviations from low-density SiO2 seen for T = 5K. These results, discussed in the context of the spin-relaxation dynamics of dangling bond states of other silicon-based disordered solids, indicate the suitability of E' centers in high-density SiO2 as probe spins for SSTFM.

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Section: Introductionmentioning

confidence: 99%

Spin-Relaxation Dynamics ofE′Centers at High Density inSiO2Thin Films for Single-Spin Tunneling Force Microscopy

et al. 2015

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“…The strong hyperfine splitting is explained by the one due to 29 Si (Silsbee, 1961). Since the early stage of the studies on this center, it is well known that its signal intensity increases on heating (e. g. Weeks and Nelson, 1960). The electronic process for this phenomenon was proposed by Jani et al (1983), who suggested that that the electronic holes at Al hole centers activated by heating are transferred to diamagnetic oxygen vacancies with two electrons (Si-Si bond).…”

Section: Introductionmentioning

confidence: 99%

The E1’ center in natural quartz: Its formation and applications to dating and provenance researches

Toyoda

2011

Geochronometria

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Quartz is one of the minerals useful for electron spin resonance (ESR) dating. The E 1 ' center is one of well-known paramagnetic defects in crystalline quartz. This center has a unique feature; its intensity increases on heating. An electronic process to explain this increase was found to be controlled not only by the number of oxygen vacancies, which are the precursors, but also by the number of Al hole centers, which depend on the previous radiation dose and on the Al concentration. The maximum intensity on heating is called the heat treated E 1 ' center, which has been posited to correspond to the number of oxygen vacancies in quartz and was found to be correlated with the ages of the host granites (Toyoda and Hattori, 2000). The experimental results on spin-spin relaxation times of the E 1 ' center indicate that external beta and gamma rays create oxygen vacancies in natural quartz rather than alpha or alpha recoil particles (Toyoda et al., 2005). The correlation between the numbers of the oxygen vacancies in quartz and the ages of the host granite made it possible to distinguish the quartz of a sedimentary reservoir from another with different age of crystallization (Toyoda and Naruse, 2002). Quartz fractions extracted from leoss and atmospheric deposition in Japan and from sediments in Japan sea were analyzed by ESR. The temporal change of the contributions from two dust sources in China were discussed in the context of climate change.

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“…It is well known that its signal intensity increases during heating (e. g. Weeks and Nelson, 1960). Jani et al (1983) attributed this phenomenon to an electronic process in which activated by heating holes at Al hole centres are transferred to diamagnetic oxygen vacancies with two electrons (Si-Si bond).…”

Section: The E 1 ' Centre and The Oxygen Va-cancy In Quartzmentioning

confidence: 99%

The Grain Size Influence on the E1' Centre Observed in Quartz of Atmospheric Deposition at Two Japanese Cities: A Preliminary Study

et al. 2010

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Abstract:The grain size influence on the number of oxygen vacancies in quartz was investigated by ESR in atmospheric deposition collected at two Japanese cities, Fukuoka and Akita, in 1969 and 1971. The finer grain size fraction shows the highest value of concentration of oxygen vacancies, most closely resembling dust originating in the Taklamakan desert. Month to month and year to year variation of the dependence was also observed which could possibly be attributed to the variation of the mixture ratio of at least two dust sources in China, A conclusive statement can not be made at this stage.

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Trapped Electrons in Irradiated Quartz and Silica: II, Electron Spin Resonance

Cited by 203 publications

References 7 publications

Spin-Relaxation Dynamics ofE′Centers at High Density inSiO2Thin Films for Single-Spin Tunneling Force Microscopy

Spin-Relaxation Dynamics ofE′Centers at High Density inSiO2Thin Films for Single-Spin Tunneling Force Microscopy

The E1’ center in natural quartz: Its formation and applications to dating and provenance researches

The Grain Size Influence on the E1' Centre Observed in Quartz of Atmospheric Deposition at Two Japanese Cities: A Preliminary Study

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